Database design: How to query multiple to multiple table

Question

I have a system used for exhibition in Website.

The exhibition data maybe from multi-data in difference table.

Like this design:

• Table [ExhibitionType] used for differentiate category.

• Table [ExhibitionBase] used for link extra Sub-Type table & data in different table.

My website use MySQL and PHP

Now question is I DON'T KNOW how to query it. or this design have a flaw.

---

EDIT 1:

I'm sorry I didn't express my intentions.

Example: I hope query a data list. first i need filter ExhibitionType like 1.

So i need create a SQL like : SELECT * FROM ExhibitionBase WHERE ExhibitionTypeId = 1

And second step i must read ExhibitionDataType and ExhibitionDataId each row data. And according to the different types of ExhibitionData data out to merge into the ExhibitionBase Sub-tables.

HOW TO DO use SQL query it.

This my question.

Answer 1

SELECT b.*, dt.Name, di.name
    FROM ExhibitionBase AS b
    JOIN ExhibitionDataType AS dt ON dt.id = b.ExhibitionDataType
    JOIN ExhibitionDataId   AS di ON di.id = b.ExhibitionDataId
    WHERE ExhibitionTypeId = 1

Style suggestions:

• Do not prefix column and table names with the database name; it clutters things. ("Exhibition")
• Do not have a column name the same as its table name.